4850 EP (250-5143) Installing a Parallel Device Faxback Doc. # 1017 The 25-pin parallel port is located on the back of the computer. See the "Using the Computer" section for instructions on how to connect a parallel device. The parallel port on the computer allows either unidirectional or bidirectional data transfer. In unidirectional transfer, the computer uses the port only to send data to the parallel device. In bidirectional transfer, the computer uses the port both to send output to the parallel device and to receive input from the device. (smm 08/05/93)